Mandrel-press.



W. J. 0. JOHNSON.

MANDREL PRESS.

APPLICATION FILED SEPT. 11, 1914.

LZ22,631 o Patented Apr. 17, 1917,

3 SHEETS-SHEET I.

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W. J. O. JOHNSON.

MANDREL PRESS.

" APPLICATION FILED SEPT. 17; 1914. 1,222,631 v Patented Apr. 17, 1917.

Q a 3 SHEET$SHEET 2.

by M

W. J. O, JOHNSON.

MANDREL PRESS.

APPLICATION FILED SEPT. 17. 1914.

1,222,631. Patented Apr. 17, 1917.

3 SHEETS-SHEET 3 WllTED STATE WALTER J. O. JOHNSON, OF CHICAGO, ILLINOIS, ASSIGNOR TO HARRY S. FOLGER, OF

' CHICAGO, ILLINOIS.

IEANDREL-PRESS.

Specification of Letters Patent.

Patented Apr. 17, 1917.

To all whom it may concern:

Be it known that I, WALTER J. O. J OHN son, a citizen of the United States, and a resident of the city of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in lVIandreLPresses; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, and to the numerals of reference marked thereon, which form a part of this specification.

This invention relates to an improved type of mandrel press capable of exerting (21101 1 mous pressure, and provided with a simplified mechanism for obtaining the leverages for the requisite pressures desired. In most types of mandrel presses heretofore constructed pressure has been transmitted to the ram by rack and pinion means, different gear ratios enabling different pressures to be obtained. distinct departure from such constructions .in that the thrust through the ram is ob tained directly by cam surfaces bearing upon one another, so that liability of failure of the device is obviated.

The device is so constructed, however, that the ram may be elevated and lowered rapidly for adjustment independently of the pressure producing means.

It is an object therefore of this invention to construct a machine wherein mechanisms are provided for applying a thrust to the ram due to the interaction of cams rolling upon one another, and by their eccentricity causing movement of the ram.

It is also an object of this invention to construct a mandrel press, the ram of which adapted to be thrust downwardly by the direct movement of an element locked therewith, due to the interaction of cams, which act to thrust said element downwardly, and said cams being rotated by inter-meshing cam gears.

It is also an object of this invention to construct a heavy duty machine provided with a movable head in which is journaled an actuating shaft having cams mounted This invention, however, is a thereon coacting with other cams to cause depression of said head against counterweights which act to resist such movement, said head having mechanisms associated therewith to interlock with the ram of the machine and cause downward movement thereof with said head.

It is furthermore an important objectof this invention to construct a mandrel press, the ram of which is thrust downwardly directly by interacting cams, and with cam gears for rotating said cams, one of said gears constructed to permit use of various portions thereof for the purpose of obtaining the different leverages desired.

It is finally an object of this invention to construct a mandrel uress wherein the thrust is applied to the ram through interacting cams, andso constructed that the power may be multiplied different amounts by simple adjustment of one of the members.

The invention (in a preferred form) is illustrated in the drawings, and hereinafter more fully described.

In the drawings:

Figure 1 is a front elevation with parts broken away of a device embodying the principles of my invention.

Figure 2 is an end elevation ofthe upper portion thereof with parts broken away.

Fig.3 is a central section taken on line 33 of Fig. 2, with parts shown in elevation.

F i is a detail section taken on line 4+4: of Fig. 3, with parts omitted.

Fig. 5 is a section taken on line 5 Fig. 3, with parts omitted.

Fig. 6 is a section broken away on line 66 of Fig. 3. r

Fig. 7 is a section with parts broken away on line 77 of Fig. 3.

Fig. 8 is a diagrammatic view illustrating the association of the multiplying lever mechanism.

Fig. 9 is a section taken on line 9 Fig. 8, with parts shown in elevation.

As shown in the drawings:

The machine consists of a base, denoted as a whole by the reference numeral 1, having a cylindrical upright portion 2, on the upper end of which is pivoted a rotatable table 3, which is radially notched in its periphery, as is usual in such constructions, to permit the insertion of a piece of work into position with the mandrel projecting through one of the notches or slots in the table. Extending vertically in parallel relation at each end of said base 1, are strong uprights l and 5, respectively, and rigidly mounted upon the upper ends of said uprights l and 5, is a two-part A-frame, consisting of similarly formed complemental sections 6 and 7, respectively. A ram 8, is mounted to move vertically between said A-frame sections 6 and 7, and on one edge has formed a number of rack teeth. J ournaled transversely through the lower portion of the A-frame sections is a shaft 9, which, on its outer end, is provided with a hand wheel 10, and between said sections (3 and 7, said shaft has thereon a pinion 11 which meshes at all times with the teeth of the ram 8, so that the ram may be raised or lowered for adjusting purposes by said hand wheel.

For the purpose of moving said ram downwardly under pressure a sectional head 12, is provided, the two parts of which are bolted around said ram 8, in a manner to permit movement of the ram therethrough, said head floatingas it were, in the cut-away portion of said A-frame. In order to support said head 12, in position and yet permit ready adjustment thereof, when the same is used to force the ram downwardly, a pair of counter-weighted levers 13 and 1 1-, respectively, are pivoted 011 opposite ends of said A-frame, swinging between the sections 6 and 7, thereof. Said levers are provided with tail pieces or levers 15, and 16, respectively, of which the tail piece 15, engages beneath one of the connecting bolts of the sectional head 12, and the tail piece 16, of the other counterweight mechanism engages beneath the toothed end of a central cam 17, which is integral with other cams herein after described, that are secured upona shaft 18, journaled horizontally in said head 12.

The shaft 18, is the primary actuating element of the pressure mechanism, and 011 its outer end is provided with a collar bracket 19, in which a hand rod or lever 20, is adjustably mounted, a setscrew 21, when 100sened, permitting adjustment of said rod in said collar bracket to vary the lever length of said rod. Another shaft 22, is rigidly secured in said head 12, below said shaft 18, and pivoted thereon is a heavy pawl 23, the teeth of which engage a number of the teeth on the ram 8. A counterweighted arm or lever 24:, is provided on said pawl which normally holds the same into engagement with the teeth on said ram. For the purpose of withstanding the side thrust imposed on said ram 8, by said pawl 23, and yet permitting verse rotation, and consequently prevent upward movement of said ram, except when said pawl is disengaged from the pinion. Also secured upon or formed integral with said shaft 18, are cams 29 and 30, respectively, the hearing or contact surfaces of which are circular, that is, concentric about the shaft 18, and said cams are disposed on the outer side of each of said A-frame sections 6 and 7, respectively, the cam member 17, being integrally joined with said cams 29 and 30 by means of a bridge piece 31. A shaft 32, is journaled in suitable bearings at the upper end of said sectional A-frame and secured thereon is a pair of similarly shaped cams 33 and 34:, each of which contacts one of the cams 29 and 30, respectively. It is the rotation of said cams which causes downward movement of the sectional head 12, inasmuch as the distance between the centers of the respective shafts 18 and 32, must necessarily change as said cams are rotated.

For the purpose of effecting simultaneous rotation of the respective interacting cams 29 and 33, and 30'and 3l,a number of sets of teeth, or toothed segments in the present instance shown as three, and denoted respectively by the reference numerals 35, 36 and 37, are secured upon the face of said cam 33. A gear segment 38, is adjustably mounted upon the cam 29, and for this purpose said segment 38, is provided with a pair of slots 39, near each end thereof, through which pins 40, which are rigidly secured in the side face of said cam 29, project. Another slot 41, is provided -at the middle portion of said gear segment, and a screw l 2, is inserted therethrough and threaded into said cam 29, thus holding said gear segment movably and detachably mounted upon the cam. However, in order to normally retain said gear segment centrally positioned with respect to the pins engaging thesame and thus maintaining the cams in proper relation, a spring 43, is wound about said'screw 42, and at its end bears against fixed pins ell, secured in said gear segment. Another purpose for adjustably mounting saidgear segment 38, on the cam 29, is to prevent stripping of the gear teeth in the event of the interacting cams slipping upon one another.

*As clearly shown'in Fig. 8, said various groups of teeth 35, 36, and 37, are of a vary ing radius in order that the same may remain in mesh with the gear segment 38, as said respective shafts 18 and 32, move from one another, due to the interacting cams. In order to insure proper engagement of the teeth of the gear segment 38, with any one of said groups 35, 36, or 37, as the case may be, a flange 15, is provided on each of said groups of teeth with the terminating ends of the flanges of each respective group affording a notch therebetween into which an enlarged projection or tooth 46, on said gear segment 38, may engage.

The various groups 36 and 37, of the teeth upon the cam 29, represent different leverages which may be obtained, that is, when the gear segment 38, meshes with the first group 35, the greatest leverage is obtainable, owing to the very sli ht movement effected between the shafts 18 and 32, when the cams are caused to rotate. Similarly the leverage secured when the gear segment meshes with the group 36, is slightly less than that obtained by engagement of the segment with the group 37, which is the least of all, although eventhe latter group produces a very great leverage. In order to permit engagement of said gear segment 38, with any one of the groups 35, 36 and 37, as desired, the segment is loosened from the cam 29, by unthreading the screw 42, so that the segment may be shifted laterally away from cams 33 and 34, out of mesh with the group with which it is in mesh, thus permitting the desired group to be rotated together with the cams 33 and 34, into proper position for engagement with the segments 38 after which said segment gear is shifted back into mesh with the desired group and secured in place by the screw 42.

The operation is as follows:

The piece of work to be operated upon by the ram 8, is mounted upon the table 3. and the operator rotates the hand wheel 10, to lower the ram to the desired position of adjustment, the respective pawls 23 and 26 tracking over the teeth on the ram 8 and pinion 1 1, respectively. The next operation is to select the group of teeth upon the cam 33, which it is desired to engage with the gear segment 38, and generally the operator will first begin his work by using the group 37, then the group 36, and finally the group 35, the latter, of course, giving the greatest pressure and least movement of the ram. The thrust imposed upon the ram is received through the head 12, from the respective interacting cams 30 and 3 and 29 and 33, in asmuch as the cam shaft 32, is journaled in a stationary bearing, and the cam shaft 18, is journaled in the movable or floating head 12. Of course the pawl 26, tracking on the pinion 11, which meshes with the teeth on the ram, prevents retractive movement of the ram during the progress of the work, except of course, when said pawl 26, is manually moved out of engagement with its pinion. The cams 29 and 30, may, if desired, be constructed with an eccentric contact surface similarly to the cams and 31, but it .is obvious that the particular shape thereof in order to secure relative movement between the cam shafts is immaterial.

The counterweight levers 13 and 14;, act to maintain the floating head 12, properly disposed in the A-frame, the lever 14;, acting furthermore to hold said shaft 18, rotated into an initial position, that is with the hand lever 20, elevated. This is due to the fact that the tail lever 16, engages beneath the centrally disposed cam 17, which is integral with the cams 29 and 30, of said shaft 18. After the operation on the work in the machine has been completed and the pressure released from the ram by elevating the hand lever 20, the lever 2a, is held upwardly by the operator and the counterweight lever 28, swung outwardly and the hand wheel 10, is then rotated to elevate the ram. The ample space afforded around and above the table 3, permits use of the machine for a variety of purposes, as unwieldly objects, such as axle sections of motor cars, may be placed in the machine for straightening. Of course, the machine may be put to many other uses in which great pressure is required. The thrust upon the ram from the multiplying mechanism is withstood by the interacting cams, and, owing to the fact that the gear segment 38, is adjustably mounted upon its cam, slippage between the cams which may occur in slight amounts cannot cause damage to the teeth of the gears.

I am aware that within the scope of the claims various details of construction may be varied through a wide range without dcparting from the principles of this invention. I therefore do not purpose limiting the patent granted otherwise than necessitated by the prior art.

I claim as my invention:

1. In a mandrel press a supporting table, a ram adapted to be moved toward the same, a floating head adapted to be interlocked with said ram, counterweighted means for supporting said head, and interacting gear actuated cams adapted to cause downward movement of said head and ram when said cams are rotated.

2. In a mandrel press of the class described, a ram, a head adapted to be interlocked therewith, cams journaled in said head, stationary bearings, cams journaled therein coacting with said first mentioned cams, and lever actuated gears for rotating said cams to force said head and ram downwardly.

3. In a device of the class described a frame, a ram movable therein, cam members journaled in said frame, a head in said frame adapted to be interlocked with said ram, counterweighted levers on said frame for movably supporting said head, and cams associated With said head and coacting with said first mentioned cams adapted when said respective cams are rotated to cause said head to move downwardly in the frame and said ram there-with.

l. In a device of the class described a frame, a ram movable therein, means movable in said frame adapted to interlock with said ram, counterweighted members movably supporting said means, interacting cams adapted when rotated to force said means and ram downwardly, and gear segments of varying radii adapted to intermesh with one another to cause rotation of said cams.

5. In a device of the class described a base, uprights secured thereon, a frame secured at the upper end of said uprights, a ram movable vertically therein, hand operated means for adjusting said ram, a pinion and rollers journaled in said frame for guiding said ram, a floating head mounted in said frame, means interlocking said head with said ram, and cams associated with said frame and with said movable head adapted when rotated to cause downward movement of said head and said ram therewith.

6. In a device of the class described a base, uprights secured thereon, a frame secured upon said uprights, a head floatingly mounted in said frame, a ram movable in said frame, mechanism associated with said head adapted to interlock the same with said ram, cams journaled in said frame, cams journaled in said head, and gear connections between said respective cams in said head and frame to cause simultaneous rotation thereof, said cams when rotating acting to force said head and ram downwardly under pressure.

7. In a device of the class described a frame, a ram movable therein, a head movably mounted in said frame, counterweighted levers supporting said head in position in said frame, means adapted to interlock said head with said ram, interacting cam mechanisms between said frame and head, adapted to force said'head and ram downwardly under pressure, and a plurality of gear segments associated with said cam to secure different leverages by movement of said cams.

8. In a device of the class described a frame, a ram movable therein, hand operated means for adjusting said ram, a head fioatingly mounted in said frame, interacting cams mounted respectively on said frame and head adapted when rotated to move said head downwardly and said ram therewith, mechanism for changing the adjustment of said cams to secure different leverages.

9. In a device of the class described a base, uprights thereon, a sectional A-frame mounted at the upper end of said uprights, a ram movably mounted in said A-frame, a head fioatingly mounted in said A-frame, means interlocking said head with said ram where- 'by a downward movement of said head forces said ram downwardly, rollers mounted in said A-frame to resist lateral movement'of said ram due to interaction of the head therewith, and cam mechanisms associated with said frame and head acting to thrust said head downwardly when operated.

10. In a device of the class described a frame, a ram movable therein, interacting cams for causing movement of said ram,

gears for driving said cams, and an adjustable mounting for one of said gear members to prevent stripping of the teeth of said gears in the event of slippage betweenthe cams.

11. In a device of the class described a frame, a ram movable therein, cams adapted to force said ram downwardly under pressure, gears for rotating said cams, and adjustable lever means for rotating said gears.

1:2. In a device of the class described a frame, a ram mounted therein, a floating head in said frame adapted to be interlocked with said ram, counterweights supporting the same, cams rotatably mounted in said frame, lever actuated gears for rotating said cams and bearingmeans for said cams on said floating head whereby movement of the said cams imposes pressure on said head and ram.

13. In a device of the class described a frame, a ram mounted therein, rotatable cams on saidframe, and lever actuated gears for rotating the same, said cams acting when rotated to thrust said ram downwardly under pressure.

14. In a mandrel press a frame, a ram, a head through which saidram extends and with which said ram is adapted tobe interlocked, counterweighted levers positioning said head in said frame, and cam mechanisms associated with said frame and head to impose pressure on said head and ram.

15. In a mandrel press a base an A-frame mounted thereon comprising two sections bolted to one another face to face, a ram movable therebetween, a head fioatingly mounted in said A-frame, means for locking said head on said ram, pressure producing mechanism mounted on said head and A- frame to move said head and ram, and pinioned means journaled in said frame for guiding said ram.

16. In a device of the class described, a frame, a ram vertically mounted therein, cams pivoted on said frame for actuating said ram under pressure, and means for changing the adjustment of said cams to secure different leverages.

17. In a device of the class described a frame, a ram movable therein, cams adapted to actuate said rams under pressure, a plurality of sets of toothed segments of'varying radii for actuating said cams, and adjustable means for rotating said sets of scribed my name in the presence of two subteeth. f scribing Witnesses.

18. In a device 0' the class described a frame, a ram movable therein, and adjust- WALTER JOHNSON 5 able geared cam mechanism for actuating Witnesses:

said ram at different leverages. CHARLES W. HILLS, J r.,

Intestimony whereof I have hereunto sub- FRANK K. HUDSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, D. C. 

